Simple A/C Electrical question -
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Unread 05-11-2013, 11:16 AM   #1
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1994 ZJ 
Join Date: Jul 2006
Location: Denmark
Posts: 70
Simple A/C Electrical question

For my 94 JGC I bought a Summit replacement A/C compressor. Most of the time it works fine, but occasionally it doesn't work at all. But if I wiggle the wires on the new compressor, the clutch engages and A/C is fine. Could be a loose connection, but I can't get it to not work by wiggling more.

Here's my question. The plus wire goes through a small white square plastic thing, attached to the outside of the compressor. What is that? A fusible link? A heat sensor? I'm tempted to cut it off and just connect the wires...

Jeeps: 1994 Jeep Grand Cherokee Limited 5.2, 1989 Jeep Cherokee Limited 4.0
Other: 1978 DeTomaso Longchamp, 1972 DeTomaso Pantera, 1968 Chevrolet Camaro SS
Author of Tuning Made Easy, available at
jgc98 is offline   Reply With Quote Quick reply to this message
Unread 05-11-2013, 07:08 PM   #2
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1997 ZJ 
Join Date: Dec 2008
Location: , Alabama
Posts: 8,234
Not sure if the 94 has an external diode, but if it does, this may be what you are looking at.

The diode controls the induced voltage that results from the magnetic field collapsing when the clutch disengages. The diode provides a current path to protect other components and systems.
ZeeJay1997 is offline   Reply With Quote Quick reply to this message

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